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SetHash
Combined from primary sources listed below.

In role Baggy§

See primary documentation in context for method SetHash. 

method SetHash(--> SetHash:D)

Returns a SetHash whose elements are the keys of the invocant.

my $breakfast = (eggs => 2, bacon => 3).BagHash;
my $sh = $breakfast.SetHash;
say $sh.^name;                            # OUTPUT: «SetHash␤»
say $sh.elems;                            # OUTPUT: «2␤»

In Any§

See primary documentation in context for method SetHash. 

method SetHash(--> SetHash:D) is nodal

Coerces the invocant to SetHash, whereby Positionals are treated as lists of values.